ENGINE MISFIRING DAMAGES

Question

I have a Mercdes Benz S350,W221. M272 Engine with misfiring fault code on one bank.
These are:
P0304 Misfiring Damage on Cylinder 4 TWC Damage
P0305 Misfiring Damage on cylinder 5 TWC damage
P0306 misfring damage on cylinder 6 TWC Dmage.
P0300 Multiple cylinder misfire.
I have swapped / exchanged the spark plugs, the coils, the injection nozzles and the Oxygen sensors.but the problem still remains
I observed that the Spark plugs of cylinder 4,5 and 6 are black with soot and the exhaust brings out black smoke occasionally and the engine vibrates seriously.
I want to find out if the any other thing i need to do, to solve this problem

Answer 1

Hi there,

Here is a link for all possible causes for the cylinder misfires. 

P0300 MERCEDES-BENZ - Cylinder Misfire Detected Random Cylinders

Read more: https://www.autocodes.com/p0300_mercedes-benz.html